Apparatus

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sensors Mode-S transponder

A24DC1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N248AK · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A24DC1
Octal
50446701
Decimal
10,636,737
Country
US
Tail
N248AK
Type
B739
Broadcasting now · callsign ASA1394 · 35,025 ft
Flights observed
417
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A24DC1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A24DC1 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
ASA787 Alaska Airlines 9 2026-04-18
ASA95 Alaska Airlines 5 2026-05-14
ASA684 Alaska Airlines 5 2026-07-26
ASA507 Alaska Airlines 5 2026-06-04
ASA19 Alaska Airlines 5 2026-05-05
ASA473 - 4 2026-06-22
ASA429 Alaska Airlines 4 2026-06-12
ASA352 Alaska Airlines 4 2026-06-16
ASA305 Alaska Airlines 4 2026-07-24
ASA281 Alaska Airlines 4 2026-07-02
ASA219 Alaska Airlines 4 2026-05-10
ASA216 - 4 2026-06-18
ASA1332 Alaska Airlines 4 2026-06-08
ASA698 - 3 2026-07-21
ASA642 Alaska Airlines 3 2026-05-29
ASA641 - 3 2026-06-18
ASA640 - 3 2026-06-26
ASA515 Alaska Airlines 3 2026-07-18
ASA505 - 3 2026-06-27
ASA423 Alaska Airlines 3 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1312 PDX → SAN Jul 26, 22:10 UTCJul 26, 22:15 UTC5m
2026-07-26 ASA684 SFO → LAS Jul 26, 18:10 UTCJul 26, 20:25 UTC2h 15m
2026-07-26 ASA401 DAL → SFO Jul 26, 14:40 UTCJul 26, 16:43 UTC2h 3m
2026-07-25 ASA290 PDX → EWR Jul 25, 22:15 UTCJul 26, 03:40 UTC5h 25m
2026-07-25 ASA294 SFO → EWR Jul 25, 16:00 UTCJul 25, 20:30 UTC4h 30m
2026-07-25 ASA1457 LAS → PAE Jul 25, 06:45 UTCJul 25, 07:15 UTC30m
2026-07-24 ASA305 MIA → SEA Jul 24, 23:15 UTCJul 25, 04:55 UTC5h 40m
2026-07-24 ASA305 MIA → SEA Jul 24, 15:35 UTCJul 24, 20:55 UTC5h 20m
2026-07-24 ASA54 ANC → LAS Jul 24, 09:40 UTCJul 24, 12:30 UTC2h 50m
2026-07-24 ASA212 SEA → SJC Jul 24, 03:45 UTCJul 24, 08:10 UTC4h 25m
2026-07-24 ASA212 SEA → SJC Jul 24, 03:42 UTCJul 24, 08:12 UTC4h 30m
2026-07-24 ASA1385 SJC → SEA Jul 24, 00:15 UTCJul 24, 02:10 UTC1h 55m
2026-07-24 ASA1385 SJC → SEA Jul 24, 00:15 UTCJul 24, 01:58 UTC1h 43m
2026-07-23 ASA1305 LAX → SEA Jul 23, 20:45 UTCJul 23, 22:50 UTC2h 5m
2026-07-23 ASA1602 SFO → LAX Jul 23, 18:35 UTCJul 23, 19:30 UTC55m
2026-07-23 ASA526 PDX → SFO Jul 23, 15:15 UTCJul 23, 16:50 UTC1h 35m
2026-07-23 ASA525 LAX → SEA Jul 23, 02:20 UTCJul 23, 03:50 UTC1h 30m
2026-07-23 ASA525 LAX → SEA Jul 23, 02:19 UTCJul 23, 03:34 UTC1h 15m
2026-07-22 ASA1561 ANC → SFO Jul 22, 20:40 UTCJul 23, 00:46 UTC4h 6m
2026-07-22 ASA1561 ANC → SFO Jul 22, 20:30 UTCJul 23, 01:05 UTC4h 35m
2026-07-22 ASA432 DEN → ANC Jul 22, 13:35 UTCJul 22, 18:45 UTC5h 10m
2026-07-22 ASA310 SEA → DEN Jul 22, 02:20 UTCJul 22, 04:35 UTC2h 15m
2026-07-21 ASA698 - Jul 21, 22:40 UTCJul 22, 00:35 UTC1h 55m
2026-07-21 ASA698 LAS → SEA Jul 21, 22:49 UTCJul 22, 00:27 UTC1h 38m
2026-07-21 ASA738 SEA → LAS Jul 21, 19:10 UTCJul 21, 21:20 UTC2h 10m
2026-07-21 ASA1426 LAX → ZIH Jul 21, 15:25 UTCJul 21, 17:05 UTC1h 40m
2026-07-21 ASA1310 SFO → DAL Jul 21, 03:20 UTCJul 21, 05:10 UTC1h 50m
2026-07-20 ASA1574 DFW → SEA Jul 20, 21:50 UTCJul 21, 01:15 UTC3h 24m
2026-07-20 ASA545 - Jul 20, 17:40 UTCJul 20, 20:20 UTC2h 40m
2026-07-20 ASA1623 SJC → SAN Jul 20, 14:30 UTCJul 20, 15:35 UTC1h 5m
2026-07-20 ASA539 SAN → SEA Jul 20, 01:33 UTCJul 20, 03:09 UTC1h 36m
2026-07-20 ASA539 SAN → SEA Jul 20, 01:20 UTCJul 20, 03:10 UTC1h 50m
2026-07-19 ASA582 - Jul 19, 21:50 UTCJul 19, 23:55 UTC2h 5m
2026-07-19 ASA692 - Jul 19, 18:10 UTCJul 19, 20:25 UTC2h 15m
2026-07-19 ASA78 SEA → ANC Jul 19, 11:40 UTCJul 19, 16:30 UTC4h 50m
2026-07-19 ASA77 SEA → PIT Jul 19, 05:45 UTCJul 19, 09:40 UTC3h 55m
2026-07-19 ASA611 - Jul 19, 02:05 UTCJul 19, 04:25 UTC2h 20m
2026-07-18 ASA515 BOS → PDX Jul 18, 22:05 UTCJul 19, 00:40 UTC2h 35m
2026-07-18 ASA514 PHX → PAE Jul 18, 18:10 UTCJul 18, 20:45 UTC2h 35m
2026-07-18 ASA1349 PDX → PHX Jul 18, 14:20 UTCJul 18, 17:00 UTC2h 40m
2026-07-17 ASA301 LIH → SJC Jul 17, 23:10 UTCJul 18, 04:30 UTC5h 21m
2026-07-17 ASA295 SEA → MCO Jul 17, 15:10 UTCJul 17, 21:05 UTC5h 55m
2026-07-17 ASA98 ANC → SEA Jul 17, 10:40 UTCJul 17, 13:40 UTC3h 0m
2026-07-17 ASA1560 SEA → ANC Jul 17, 05:50 UTCJul 17, 08:54 UTC3h 5m
2026-07-17 ASA1413 SJC → SEA Jul 17, 01:29 UTCJul 17, 03:14 UTC1h 45m
2026-07-16 ASA1366 SEA → SJC Jul 16, 22:26 UTCJul 17, 00:14 UTC1h 48m
2026-07-16 ASA1366 SEA → SJC Jul 16, 22:30 UTCJul 17, 00:14 UTC1h 45m
2026-07-16 ASA629 LAS → SEA Jul 16, 18:00 UTCJul 16, 20:05 UTC2h 5m
2026-07-16 ASA777 - Jul 16, 14:15 UTCJul 16, 16:25 UTC2h 10m
2026-07-16 ASA366 - Jul 16, 04:10 UTCJul 16, 05:10 UTC1h 0m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N248AK page for operator, model, and routing details .

Mode-S A24DC1 frequently asked

What is Mode-S code A24DC1?
A24DC1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N248AK.
Where is Mode-S A24DC1 registered?
Mode-S code A24DC1 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A24DC1 broadcasting right now?
Yes. Mode-S A24DC1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A24DC1, octal 50446701, decimal 10,636,737.
What flights does A24DC1 operate?
Mode-S A24DC1 has broadcast 20 distinct callsigns, including ASA787, ASA95, ASA684, ASA507, ASA19.